[单项选择]It’’s hardly news anymore that Americans are just too fat. A quick look around the mall, the beach or the crowd at any baseball game will leave no room for doubt:our individual weight problems have become a national crisis. Even so, the actual numbers are shocking. Fully two-thirds of U. S. adults are officially overweight, and about half of those have graduated to full-blown obesity. 　　It wouldn’’t be such a big deal if the problem were simple aesthetic. But excess poundage takes a terrible toll on the human body. significantly increasing the risk of heart disease, high blood pressure, diabetes, infertility, and many forms of cancer. The total medical bill for illnesses related to obesity is $117 billion a year-and climbing - and the Journal of the American Medical Association reported that poor diet and physical inactivity could soon overtake tobacco as the leading cause of preventable death in the U. S. 　　Why is it happening The obvious, almost trivial answer is that we eat too mu
A. become an obsolete source of news.
B. been a common concern in the U. S.
C. developed into a critical condition.
D. grown into a threat to the nation.

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